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One of the main reasons for the rise in U.S. GDP over the last century is the massive technological advancements that the country has experienced. Innovations and developments in various fields such as transportation, communication, medicine, and manufacturing have significantly increased productivity and efficiency. As a result, businesses can produce more goods and services at a lower cost, which contributes to the higher GDP.

Another factor that has contributed to the increase in U.S. GDP is population growth. Over the past century, the population of the United States has grown consistently due to various factors such as immigration and an increase in birth rates. A larger population means a bigger workforce, which in turn leads to higher production of goods and services. Additionally, a larger population also leads to increased consumption, ultimately driving the demand for goods and services, which contributes to the growth of GDP.

An educated workforce is crucial for economic growth, and the United States has seen a significant increase in the level of education over the past century. The widespread availability of formal education has produced a more skilled and specialized labor force. This has allowed individuals to contribute specific skills and knowledge to the economy, leading to a more efficient and diverse workforce. As such, an educated population translates into a higher GDP as the economy benefits from increased productivity, innovation, and industry growth.

Globalization has been another important factor contributing to the growth of U.S. GDP over the past century. With the expansion and strengthening of international trade, capital flows, and communication, the United States has gained access to larger markets and resources. This has allowed U.S. businesses to increase production, reduce costs, and better specialize in their comparative advantages, ultimately leading to a higher GDP by facilitating greater international trade and investment.

Finally, various government policies and economic factors have played a significant role in the growth of U.S. GDP. For instance, the U.S. government has implemented policies that promote economic growth, such as investing in infrastructure, research and development, and providing a stable environment for businesses to thrive in. Additionally, economic factors such as low inflation rates, stable interest rates, and a strong financial market have also contributed to the growth of the U.S. economy. In conclusion, multiple factors such as technological advancements, population growth, increased education, globalization, and government policies have driven the growth of U.S. GDP over the past 50 to 100 years, making it significantly higher today than it was in the past.